1 /*
2 * Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the License); you may
5 * not use this file except in compliance with the License.
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 */
9
10 #include <stdio.h>
11 #include <string.h>
12 #include <stdlib.h>
13 #include <gmssl/sm2.h>
14 #include <gmssl/error.h>
15
16
main(void)17 int main(void)
18 {
19 SM2_KEY sm2_key;
20 SM2_KEY pub_key;
21 SM2_SIGN_CTX sign_ctx;
22 unsigned char dgst[32];
23 unsigned char sig[SM2_MAX_SIGNATURE_SIZE];
24 size_t siglen;
25 int ret;
26
27 sm2_key_generate(&sm2_key);
28
29 memcpy(&pub_key, &sm2_key, sizeof(SM2_POINT));
30
31 // sign without signer ID (and Z value)
32 sm2_sign_init(&sign_ctx, &sm2_key, NULL, 0);
33 sm2_sign_update(&sign_ctx, (unsigned char *)"hello ", strlen("hello "));
34 sm2_sign_update(&sign_ctx, (unsigned char *)"world", strlen("world"));
35 sm2_sign_finish(&sign_ctx, sig, &siglen);
36 format_bytes(stdout, 0, 0, "signature", sig, siglen);
37
38 // digest and verify
39 sm3_digest((unsigned char *)"hello world", strlen("hello world"), dgst);
40 ret = sm2_verify(&pub_key, dgst, sig, siglen);
41 printf("verify result: %s\n", ret == 1 ? "success" : "failure");
42
43 // use verify update API
44 sm2_verify_init(&sign_ctx, &pub_key, NULL, 0);
45 sm2_verify_update(&sign_ctx, (unsigned char *)"hello world", strlen("hello world"));
46 ret = sm2_verify_finish(&sign_ctx, sig, siglen);
47 printf("verify result: %s\n", ret == 1 ? "success" : "failure");
48
49 // sign use default signer ID
50 sm2_sign_init(&sign_ctx, &sm2_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH);
51 sm2_sign_update(&sign_ctx, (unsigned char *)"hello ", strlen("hello "));
52 sm2_sign_update(&sign_ctx, (unsigned char *)"world", strlen("world"));
53 sm2_sign_finish(&sign_ctx, sig, &siglen);
54 format_bytes(stdout, 0, 0, "signature", sig, siglen);
55
56 sm2_verify_init(&sign_ctx, &pub_key, SM2_DEFAULT_ID, SM2_DEFAULT_ID_LENGTH);
57 sm2_verify_update(&sign_ctx, (unsigned char *)"hello world", strlen("hello world"));
58 ret = sm2_verify_finish(&sign_ctx, sig, siglen);
59 printf("verify result: %s\n", ret == 1 ? "success" : "failure");
60
61 return 0;
62 }
63